Pixie Dust is a crafting material dropped by Pixies. It is needed to craft Greater Healing Potions, Holy Water, the latter of which spreads The Hallow, and other Hallow-related objects. When Pixies drop this item, or if it is thrown on the ground, it produces a glow and some light. As Pixies can only spawn in The Hallow, Hardmode must be activated to obtain Pixie Dust.